人口与人力资源问题是一种极其复杂的（）.A、政治问题 B、经济问题 C、社会问题 D

阅读理解。

     Thirty years ago, Lake Ponkapog in Hartwell, New Jersey, was full of life. Many birds and animals

lived beside the water, which was full of fish. Now there are few birds, animals, and fish. The lake water

is polluted. It is in a colour of dirty brown, and it is filled with strange plants.

     How did this happen? First, we must think about how water gets into Lake Ponkapog. When it rains,

water comes into the lake from all around. In the past, there were forests all round Lake Ponkapog, so the

rainwater was clean.

     Now there are many homes around the lake. People often use the chemicals (化学制品) in their gardens.

They use other chemicals inside their houses for cleaning and killing insects. There are also many businesses.

Businesses use chemicals in their machines of shops. Other chemicals fall onto the ground from cars or

trucks. When it rains, the rainwater picks up all the chemicals from home and businesses and then carries

them into the lake. They pollute the water and kill the animals.

     Boats on the lake are also a problem. Lake Ponkapog is a popular place for motorboats (汽船). But oil and

gas (汽油) from boats often get into the lake. So more bad chemicals go into the water this way.

     People in Hartwell are worried. They love their lake and want to save it. Will it be possible? A clean lake

must have clean rainwater going into it. Clean rainwater is possible only if people are more careful about

chemicals at home and at work. They must also be more careful about gas and oil and other chemicals on

the ground. And they mustn't use motorboats any more on the lake. All these may change people's lives. Only

then can Lake Ponkapog be a beautiful, clean lake again.

1. In the past, the water in Lake Ponkapog was made clean by ______. [ ]

A. forests

B. rain

C. birds

D. fish

2. Chemicals from homes and businesses ______. [ ]

A. are always clean

B. can help the animals

C. are good for the lake

D. get into the rainwater

3. Cleaner rainwater will mean ______. [ ]

A. more boats on the lake

B. more dirty things in the lake

C. a cleaner lake

D. a dirty lake

4. To save Lake Ponkapog, people need to ______. [ ]

A. be more careful about chemicals

B. use the water

C. grow fewer plants in the gardens

D. use more motorboats on the lake

5. The passage is about ______. [ ]

A. boats on the Lake Pankapog

B. why the water is dirty in Lake Ponkapog

C. clean rainwater

D. dirty lakes

男，30岁。饥饿时上腹痛10年，一天前呕血1次，约5ml，最可能的原因是（）

A.胃黏膜脱垂

B.消化性溃疡

C.急性糜烂出血性胃炎

D.胃癌

E.肝硬化食管胃底静脉曲张

　　下面是2010年上海世界博览会中国馆的外形图，现已征集到两个馆名，请你用这两个馆名开头，写一个7字以上（含馆名）的对偶句，把馆名的含义表达出来。

炎黄鼎____________________________________

华博台____________________________________

（五） 某建筑工程施工进度计划网络图如下：

施工中发生了以下事件：

事件一：A工作因设计变更停工10d。

事件二：B工作因施工质量问题返工，延长工期7d。

事件三：E工作因建设单位供料延期，推迟3d施工。

事件四：在设备管道安装气焊作业时，火星溅落到正在施工的地下室设备用房聚氨脂肪水涂膜层上，引起火灾。

在施工进展到第120d后，施工项目部对第110d前的部分工作进行了统计检查。

统计数据见下表。

截止到第110天的合计BCWP值为2900万元。

问题：

施工现场焊、割作业的防火要求有哪些？

关于软件质量的描述，正确的是___( )___。

A．软件质量是指软件满足规定用户需求的能力

B．软件质量特性是指软件的功能性、可靠性、易用性、效率、可维护性、可移植性

C．软件质量保证过程就是软件测试过程

D．以上描述都不对